Header,teflon, Muffler?

[Ron Van Putte]

Gene Maurice wrote:

> Buddy,
>  
> What I used on my YS's is a MAC's 3.5cc Quiet Pipe. The only mod I did 
> to them was open up the two holes in the muffling baffle to 1/4". I 
> used this set up on both 120 AC's and a 140 L. As compared to a 
> Hatori, it may be 100 RPM less due to the reduced size but it only 
> weighs 2.4 oz. and is less that $40 at most hobby shops (at least the 
> last time I bought one). It's an effective, simple, and cheap alternative.
>  


I use an unmodified 6.5 cc Macs quiet pipe on my YS 1.40L.  Works for me 
too.

Ron Van Putte

>     -----Original Message-----
>     From: discussion-request at nsrca.org
>     [mailto:discussion-request at nsrca.org]On Behalf Of BUDDYonRC at aol.com
>     Sent: Saturday, September 27, 2003 8:49 AM
>     To: discussion at nsrca.org
>     Subject: Header,teflon, Muffler?
>
>     I have been having occasional problems with RPM and what seems
>     like overheating on my YS-140-L. I have come to believe the
>     problem is restriction in the muffler, but the muffler seems to be
>     open and OK
>     The problem seems to have something to do with the prop size also.
>     Running a 15-1/2 x 13N rpm at about 8200 everything is fine,
>     switched to a 16 x11 and running @ 8400 rpm and later in the
>     flight the power back's off, I think it is heating up.
>     Yesterday I switched to a 16 x10 prop turning 8800 rpm and half
>     way through the flight I heard a loud pop, After that the engine
>     would not turn up. I landed and found that the Teflon coupler had
>     split long ways about three inches long and had curled inward
>     restricting the flow. This has happened on two different mufflers
>     a Hatori and a Johnson that is shaped like the Hatori Has anyone
>     run into this problem before? and what is the solution?  Is there
>     another Aluminum muffler that will work? I have another setup
>     using a CF muffler and have not had problems with it even at
>     9000rpm with a 16 x11 prop but choke when I think of spending
>     $175.00 for another muffler.
>     Buddy    
>

-------------- next part --------------
An HTML attachment was scrubbed...
URL: http://lists.f3a.us/pipermail/nsrca-discussion/attachments/20030928/cf6440d7/attachment.html